题目内容
以下可作为最常用到的薄膜衣材料的是（）
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信号继电器有着良好的（），可利用其接点构成各种控制和表示电路。
铁路信号对继电器的要求表述错误的是（）。
信号继电器由（ ）和接点系统两大部分组成。
Cet-6-1.12-Exercise 01H) What took place after World War II was not the revival of a 1920s economy, with its small farming units, urban manufacturing, and plurality of laborers. Instead, the 1950s saw the creation of a new suburban economy, with a plurality of white-collar workers. With an expanded transportation and communications infrastructure, businesses needed telephone operators, shipping clerks and similar occupations. If you could read, follow simple instructions, and settle into a routine, you could find a job in the post-war economy.
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